懒得写字,贴代码吧

window.onload = function() {

//js浮点数精确计算
var accMul = function(arg1, arg2) {
var m = 0,
s1 = arg1.toString(),
s2 = arg2.toString();
try {
m += s1.split(".")[1].length
} catch(e) {}
try {
m += s2.split(".")[1].length
} catch(e) {}
return Number(s1.replace(".", "")) * Number(s2.replace(".", "")) / Math.pow(10, m);
};

var digitUppercase = function(n) {
var fraction = ['角', '分'];
var digit = ['零', '壹', '贰', '叁', '肆', '伍', '陆', '柒', '捌', '玖'];
var unit = [['元', '万', '亿'], ['', '拾', '佰', '仟']];
var head = n < 0 ? '欠': ''; //取绝对值 并 转成数值型 n = Math.abs(n); var s = ''; //Math.floor(x)取小于x的最大整数 //Math.pow(x,y)取x的y次方 //取小数点后边的值 并 转换 for (var i = 0; i < fraction.length; i++) { s += (digit[Math.floor(accMul(n, 10) * Math.pow(10, i)) % 10] + fraction[i]).replace(/零./, ''); } s = s || '整'; n = Math.floor(n); for (var i = 0; i < unit[0].length && n > 0; i++) {
var p = '';
for (var j = 0; j < unit[1].length && n > 0; j++) {
p = digit[n % 10] + unit[1][j] + p;
n = Math.floor(n / 10);
}
s = p.replace(/(零.)*零$/, '').replace(/^$/, '零') + unit[0][i] + s;
}
return head + s.replace(/(零.)*零元/, '元').replace(/(零.)+/g, '零').replace(/^整$/, '零元整');
};

// console.log(digitUppercase(7682.01)); //柒仟陆佰捌拾贰元壹分
// console.log(digitUppercase(7682)); //柒仟陆佰捌拾贰元整
// console.log(digitUppercase(951434677682.00)); //玖仟伍佰壹拾肆亿叁仟肆佰陆拾柒万柒仟陆佰捌拾贰元整
var upCase = document.getElementById('toUpcase');
var show = document.getElementById('show');
//console.log(show);
upCase.focus();
upCase.onkeyup = function() {
var thisNum = upCase.value;
var upNum = digitUppercase(thisNum);

if (thisNum >= 1e12) {
show.innerHTML = '金额过多';
return;
} else if (thisNum <= -1e12) { show.innerHTML = '金额过少'; return; } ! /^-?\d+(\.\d+)?$/.test(thisNum) ? show.innerHTML = '请输入金额': show.innerHTML = upNum;; } }

点击查看实例:数字金额转中文大写demo
下载源码:下载源码

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